7985784975669 has 24 divisors (see below), whose sum is σ = 11888857885632. Its totient is φ = 5162141378880.

The previous prime is 7985784975659. The next prime is 7985784975671. The reversal of 7985784975669 is 9665794875897.

It is a happy number.

7985784975669 is a `hidden beast` number, since 7 + 9 + 8 + 5 + 7 + 8 + 497 + 56 + 69 = 666.

It is not a de Polignac number, because 7985784975669 - 2⁷ = 7985784975541 is a prime.

It is a super-2 number, since 2×7985784975669² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7985784975629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66325417 + ... + 66445710.

It is an arithmetic number, because the mean of its divisors is an integer number (495369078568).

Almost surely, 2^{7985784975669} is an apocalyptic number.

It is an amenable number.

7985784975669 is a deficient number, since it is larger than the sum of its proper divisors (3903072909963).

7985784975669 is a wasteful number, since it uses less digits than its factorization.

7985784975669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132771337 (or 132771334 counting only the distinct ones).

The product of its digits is 57610828800, while the sum is 90.

The spelling of 7985784975669 in words is "seven trillion, nine hundred eighty-five billion, seven hundred eighty-four million, nine hundred seventy-five thousand, six hundred sixty-nine".